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Short Communications 31 Short Communications POST-BREEDING DISPERSAL OF NORTHERN GIANT PETRELS MACRONECTES HALLI FROM MARION TO BOUVET ISLANDS D.G. KEITH1, B.I.B. HARCK1, P.G. RYAN1 & F. MEHLUM2 1Percy FitzPatrick Institute of African Ornithology, University of Cape Town, Rondebosch 7701, South Africa ([email protected]) 2Norwegian Polar Institute, PO Box 5072 Majorstua, N-0310 Oslo, Norway Received 27 June 2001, accepted 7 January 2002 Bouvet Island or Bouvetøya (54°25'S, 3°21'E) is the most isolated adult male movement to South Africa (Gartshore et al. 1988). island in the world. Nyrøysa is a rocky platform on the west coast Including a banded Southern Giant Petrel M. giganteus seen at of Bouvetøya, formed by a landslide sometime between 1955 and Nyrøysa in February 1999 when the band number was not re- 1958 (Prestvik & Winsnes 1981). Approximately five Northern corded (Isaksen et al. 2000), these are the only records from Giant Petrels were observed at Nyrøysa during the 2000/01 aus- Bouvet of birds of any species banded elsewhere. tral summer. Two of these were colour-banded, seen feeding on dead Antarctic Fur Seal Arctocephalus gazella pups. The first, a male (SAFRING No. 9-73306 and orange alphanumeric plastic ACKNOWLEDGEMENTS band 09A), seen on 16 February, was banded as a chick on Marion Island on 29 January 1991. It bred there in 2000/01 and was last We thank the Norwegian Polar Institute, Alfred Wegener Institute, seen incubating on 29 August 2000. This breeding attempt had crew and pilots of the Polarstern and Lance, SAFRING, John failed by 12 September 2000, and the bird was not recorded at Cooper, Deon Nel, Greg Hofmeyr, Marthan Bester, Chris Tobler Marion again that season (D.C. Nel pers. comm.). This bird had and Lionel Mansfield for help and support. been previously recorded at Bouvet Island on 2 February 1999 (Isaksen et al. 2000). It had bred at Marion Island in 1998/99 and was last seen at its the breeding site that season with a large chick REFERENCES on 12 January 1999 (Isaksen et al. 2000). COOPER, J., BROOKE, M. de L., BURGER, A.E., CRAW- The second banded Northern Giant Petrel was recorded at Nyrøysa FORD, R.J.M., HUNTER, S. & WILLIAMS, A.J. 2001. on 21 February 2001. This bird, a male (SAFRING No. 9-59291, Aspects of the breeding biology of the Northern Giant Petrel previously 9-52523 and black alphanumeric plastic band 323) was (Macronectes halli) and the Southern Giant Petrel (M. banded as a breeding male on 3 November 1984 on Marion Island, giganteus) at sub-Antarctic Marion Island. International Jour- and last reported breeding on 16 September 1991 (D.C. Nel pers. nal of Ornithology 4: 53–68. comm.). Its breeding site on the west coast of Marion Island means GARTSHORE, N.A., COOPER, J. & HUNTER, S. 1988. Bird that the round-island breeding census (Cooper et al. 2001) can ringing at Marion and Prince Edward Islands, 1982–1987; with easily miss one of the breeding partners. It is therefore possible an analysis of movements since 1951. South African Journal that this bird bred in 2000/01 (D.C. Nel pers. comm.). of Antarctic Research 18: 23–29. ISAKSEN, K., HUYSER, O., KIRKMAN, S., WANLESS, R. & These records suggest a regular post-breeding dispersal of male WILSON, W. 2000. Studies of seabirds and seals on Northern Giant Petrels from Marion Island to Bouvet Island. Ear- Bouvetøya 1998/99. Norsk Polarinstitutt Internrapport 2. lier recoveries and recaptures of Northern Giant Petrels banded at Tromsø: Norsk Polarinstitutt. Marion Island indicate dispersal of fledglings to waters close to PRESTVIK, T. & WINSNES, T.S. 1981. Geology of Bouvetøya. the New Zealand mainland and Tasmania, Australia, as well as an Norsk Polarinstitutt Skrifter 175: 41–69. Marine Ornithology 30: 31 (2002) 32 AT-SEA RECORDS OF THREE RARELY REPORTED PETREL SPECIES IN THE SOUTH-WESTERN ATLANTIC OCEAN SANTIAGO IMBERTI Rivadavia 780, 9400 Río Gallegos, Argentina ([email protected]) Received 19 February 2001, accepted 7 January 2002 During the austral summer of 1999/2000 I observed birds at sea position at the time when the bird actually reached the ship and between Ushuaia, Argentina and the Antarctic Peninsula on four the coordinates that were taken the next morning, but as the ship’s occasions, visiting several sub-Antarctic islands and also cover- course was direct from the Antarctic Peninsula to Cape Horn, the ing the Falkland Islands–Buenos Aires transect aboard the R.V. diving petrel had wandered about 1500 km from its closest known Akademik Shuleykin and R.V. Akademik Ioffe. I report here on breeding grounds at South Georgia. Other diving petrels are observations of three rarely recorded species. capable of a similar dispersion as confirmed by the record of Magellanic Diving Petrel P. magellani in the Drake Passage (Blendinger 1998) and the sighting of several unidentified diving SPECIES OBSERVED petrels on 8 March 2000 between 59°42'S, 59°42'W and 59°32'S, 59°41'W (pers. obs.). Spectacled Petrel Procellaria conspicillata The Georgian Diving Petrel is almost impossible to identify at sea, I observed this species three times. The first observation took given its close similarity to the Common Diving Petrel P. urinatrix place on 13 March 2000, 15h00 local time, at 46°14'S, 59°11'W. (Harrison 1985, Enticott & Tipling 1998). The known range of the At 18h40 the same day, a different bird, based on markings, was Georgian Diving Petrel is confined to the sub-Antarctic zone seen at 45°28'S, 58°54'W. The third record is of two birds on 14 where it breeds at a number of islands. It is probably sedentary and March 2000, at 41°44'S, 57°36'W. This last record was made spreads only into seas surrounding the breeding sites, although close to the edge of Argentine territorial waters, and I presume the some members of colonies seem to wander farther away (Harrison petrel extends its range into this zone and will prove to be a new 1985, Carboneras 1992, Enticott & Tipling 1998). addition to the Argentinean avifauna. Many other birds breeding in the Tristan da Cunha Group (for examples see Dabbene 1921, Leach’s Storm Petrel Oceanodroma leucorhoa 1922, 1923), show the same pattern. On 14 March 2000 at 40°20'S, 57°07'W, a mixed flock of about The pelagic distribution of the Spectacled Petrel outside its breed- 20 storm petrels was flushed from the water, providing good views ing grounds at Inaccessible Island is becoming better known and for several minutes. Two Leach’s Storm Petrels were identified has been estimated to cover an area extending from the coasts of among the majority of Wilson’s Storm Petrels Oceanites South America to South Africa between 25°S and 41°S (Enticott oceanicus that formed the group. The Leach Storm Petrels looked & O’Connell 1985, Olmos 1997, Ryan 1999, Camphuysen & Van larger and somewhat browner than the Wilson Storm Petrels, Deer Meer 2000). The last authors also suggest there is a non- showing a characteristic white band on the upper wings, with breeding population over deep oceanic waters, far from their longer and more slender wings bent at the carpal joint. The flight breeding grounds, that the records presented here seem to confirm. involved less flapping than Wilson’s, gliding most of the time, The petrel seems to be associated with warmer waters north of the with the wings held below the body. Looking down on the birds Sub-tropical Convergence, although a few wander farther south I could see the white rump divided by a greyish central line (Rumboll & Jehl 1977). There are also some records made by towards the forked tail. Gould in the 19th century who stated that he saw spectacled birds in considerable numbers near the Falkland Islands, suggesting a This species occurs mainly in the North Pacific and Atlantic wider range (Rowan et al. 1951). However, there have been no Oceans but it has also been rarely reported in the Southern Ocean subsequent records from latitudes south of 41°S. (Biermann & Vous 1950, Veit et al. 1996, Arballo & Cravino 1999) as far south as the South Shetland Islands in Antarctica Georgian Diving Petrel Pelecanoides georgicus (Hahn & Quillfeldt 1998) as well as breeding off the coast of South Africa (Whittington et al. 1999). Although it is common One bird was found freshly dead aboard the vessel on 16 January and often observed over the Equatorial Counter-current (Harris & 2000 when our position was halfway from the Antarctic Peninsula Hansen 1974, Bourne & Curtis 1984) it has not been previously to the Cape Horn area, at 58°09'S, 61°08'W. The bird was identi- reported by most authors working off South America (Cooke & fied using Harrison’s (1985) sketches of the bills of the different Mills 1972, Jehl 1974, Rumboll & Jehl 1977, Jehl et al. 1979, Veit diving petrels. Unfortunately, the specimen could not be preserved 1995, Orgeira 1997). but was photographed. There is of course a difference between the Marine Ornithology 30: 32–33 (2002) Imberti: Three rarely reported petrel species in the south-western Atlantic Ocean 33 ACKNOWLEDGEMENTS book of the seabirds of the world. London: New Holland Pub- lishers. Thanks are due to Juan Mazar Barnett for providing good advice HAHN, S. & QUILLFELDT, P. 1998. First record of a Leach’s on references and how to improve the text, to Mark Pearman for Storm Petrel Oceanodroma leucorhoa for King George Island, some references and useful comments on the manuscript and to South Shetlands, Antarctica. Marine Ornithology 26: 80. Eugenio Coconier for the literature searches.
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